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White matter is located at the base of the brain between the cerebellum and the brainstem. It is made of long nerve fibers called axons. The axons are insulated by myelin, sheaths of fat that give the region the white color for which it is named. The myelin helps speed up the transmission of signals along the axons.
It is also the myelin that is responsible for the white appearance of the white matter. 60 percent of the brain is comprised of white matter. Summary: 1. Grey matter is made up of nerve cell bodies, and white matter is made up of fibers. 2. Unlike the white matter, the neurons of grey matter do not have extended axons.